Sounds like, as Mamy mentions, you ALL need therapy....he used to hit her raw and make her blue for a week when she was only 5!...thats NOT a father!
and you say " I cannot understand why she is so unhappy."
You try to make it better, for you, by saying she has clothes and a lot of children have no food!
What's that about?.....LOVE is what she needed and ALL children crave for....not beatings and instability.
Hope you get it sorted, as you should, if only for your daughters sake.....PLEASE.